摘要
码率控制是在低带宽信道上传输低延迟、高质量视频的关键技术之一.根据基于PSTN信道的远程视频监控应用需求,提出一种甚低码率控制策略,通过为视频编码器增加I帧码率控制,改进P帧的位率控制算法,以及引入二阶率失真模型,较好地解决了甚低带宽下视频编码器的码率控制问题.实验结果表明,算法降低了编码缓冲区延迟同时提高了重建图像的质量.
Rate control is one of critical technologies that are used to transmit low-delay and high-quality images on the channel of very low bandwidth. According to the application demand of remote surveillance system based on PSTN, this paper proposed a rate control scheme of very low bandwidth. The video coder gained good performance at even low bandwidth by adding I-frame rate control and improved P-frame control based on the quadratic rate distortion model. Experiments show that this scheme reduces the delay of encoder buffer greatly, and improves the quality of reconstructed images as well.
出处
《小型微型计算机系统》
CSCD
北大核心
2005年第5期810-812,共3页
Journal of Chinese Computer Systems
基金
国家"八六三"计划项目 (2 0 0 1AA114 14 2 )资助
国家自然科学基金 (60 0 75 0 0 6)资助
